Question

120 gm acetic acid is dissolved in 78gm benzene. find mole fraction of benzene

Answer 1

Answer:

Mole fraction is a unit of concentration, defined to be equal to the number of moles of a component divided by the total number of moles of a solution.

Because it is a ratio, mole fraction is a unitless expression. The mole fraction of all components of a solution, when added together, will equal 1.

We know No. of moles=

Molar−mass

Given−mass

Molar mass of Benzene=78

Molar mass of Toluene=92

Hence, No. of mole of Benzene=

78

7.8

= 0.1 moles

No. of moles of toluene=

92

46

= 0.5 moles

So, Mole fraction of Benzene=

0.5+0.1

0.1

=

6

1